Nucleic acids for inhibiting hairless protein expression and methods of use thereof

ABSTRACT

The present invention provides DNAzymes and ribozymes that specifically cleave Hairless protein mRNA. The present invention also provides antisense oligonucleotides that specifically inhibit translation of Hairless Protein mRNA. The present invention also provides various methods of inhibiting the expression of Hairless Protein. Finally the invention provides pharmaceutical compositions containing the instant DNAzymes, ribozymes and antisense oligonucleotides as active ingredients.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional of U.S. patent application Ser. No. 12/139,818 filed Jun. 16, 2008, which is a continuation of copending U.S. patent application Ser. No. 10/122,013 filed Apr. 12, 2002, which claims the benefit of priority of U.S. Provisional Application No. 60/283,618 filed Apr. 13, 2001, the contents of each of which are hereby incorporated by reference in their entirety.

BACKGROUND OF THE INVENTION The Hairless Gene

The hairless mouse, a frequent subject of different dermatological experiments, is characterized by hair loss that starts at the age of 14 days postpartum from the upper eyelids and progresses caudally. The process is completed by the age of 3 weeks, when the mice are entirely naked and never grow hair again (Panteleyev et al. 1998b). The phenotype results from proviral integration and consequential aberrant splicing in the mouse hairless gene. Lack of expression of the mouse hairless gene due to inherited mutations leads to the complete loss of hair, known as atrichia. Other mutations have been identified in other mouse hairless alleles, and its human equivalent, resulting in essentially similar phenotypes (Ahmad et al. 1998a; Ahmad et al. 1998b; Panteleyev et al. 1998a). Those studies demonstrated that hairless expression in the hair follicle is necessary for hair cycling, specifically in the transition to the catagen phase.

Catalytic Nucleic Acid Molecules

Gene therapy is perhaps the most exciting promise of modern medical science. The technology of replacing mutant genes with correct ones can provide definitive therapy for a number of diseases. There are, however, conditions—inherited and acquired alike—which cannot be treated by the introduction of a new gene. In many cases, the ablation of an already existing gene may be desirable. In many dominantly inherited diseases, the successful “knock-out” of the mutant gene is, in theory, sufficient to cure the disease. In some other cases, the elimination of a normally functioning, wild-type gene may be necessary for therapeutic gene targeting.

Such is the case in abundant hair growth or hirsutism, in which inhibiting genes which promote hair growth could lead to decreased hair growth and, therefore, improvement. One way to achieve targeted, transient gene suppression is likely going to be through the use of catalytic nucleic acid technology, which includes both ribozymes and DNAzymes.

Ribozymes are RNA structures having a self-catalytic enzymatic function which, together with their sequence-specific and RNA-binding ability, make them capable of cleaving other RNA molecules at specific target sequences (Cech 1987). Recent success has been achieved in engineering ribozymes capable of selectively recognizing target sequences carrying different types of mutations, including single base-pair missense mutations (Parthasarathy et al. 1999; Sioud and Drlica 1991; Vaish et al. 1998).

These encouraging achievements give new perspective to experimental strategies using selective mRNA ablation (Phylactou et al. 1998). The different groups of ribozymes described thus far (including hairpin ribozymes, hammerhead ribozymes and group I intron ribozymes (Bartel 1999)) have different characteristics with respect to their mechanism of splicing, splicing efficiency and target specificity. Several studies have used hammerhead ribozymes to selectively cleave RNA because of the superior target specificity of these ribozymes (Long and Sullenger 1999; Phylactou et al. 1998; Vaish et al. 1998).

Ribozymes can be delivered exogenously, such that the ribozymes are synthesized in vitro. They are usually administered using carrier molecules (Sioud 1996) or without carriers, using ribozymes specially modified to be nuclease-resistant (Flory et al. 1996). The other method is endogenous delivery, in which the ribozymes are inserted into a vector (usually a retroviral vector) which is then used to transfect target cells. There are several possible cassette constructs to chose from (Vaish et al. 1998), including the widely used U1 snRNA expression cassette, which proved to be efficient in nuclear expression of hammerhead ribozymes in various experiments (Bertrand et al. 1997; Michienzi et al. 1996; Montgomery and Dietz 1997).

Recent efforts have led to the successful development of small DNA oligonucleotides that have a structure similar to the hammerhead ribozyme (Santoro and Joyce 1997). These molecules are known as “deoxy-ribozymes”, “deoxyribozymes” and “DNAzymes”, and are virtually DNA equivalents of the hammerhead ribozymes. They consist of a 15 by catalytic core and two sequence-specific arms with a typical length of 5-13 by each (Santoro and Joyce 1998). Deoxy-ribozymes have more lenient consensus cleavage site requirements than hammerhead ribozymes, and are less likely to degrade when used for in vivo applications. The most widely used type of these novel catalytic molecules is known as the “10-23” deoxy-ribozyme, whose designation originates from the numbering used by its developers (Santoro and Joyce 1997). Because of their considerable advantages, deoxy-ribozymes have already been used in a wide spectrum of in vitro and in vivo applications (Cairns et al. 2000; Santiago et al. 1999).

SUMMARY OF THE INVENTION

This invention provides a catalytic deoxyribonucleic acid molecule that specifically cleaves Hairless Protein mRNA comprising:

-   -   (a) a catalytic domain that cleaves mRNA at a defined consensus         sequence;     -   (b) a binding domain contiguous with the 5′ end of the catalytic         domain; and     -   (c) a binding domain contiguous with the 3′ end of the catalytic         domain,

wherein the binding domains are complementary to, and therefore hybridize with, the two regions flanking the defined consensus sequence within the Hairless Protein mRNA at which cleavage is desired, and wherein each binding domain is at least 4 residues in length, and both binding domains have a combined total length of at least 8 residues.

This invention also provides a catalytic ribonucleic acid molecule that specifically cleaves Hairless Protein mRNA comprising:

-   -   (a) a catalytic domain that cleaves mRNA at a defined consensus         sequence;     -   (b) a binding domain contiguous with the 5′ end of the catalytic         domain; and     -   (c) a binding domain contiguous with the 3′ end of the catalytic         domain,

wherein the binding domains are complementary to, and therefore hybridize with, the two regions flanking the defined consensus sequence within the Hairless Protein mRNA at which cleavage is desired, and wherein each binding domain is at least 4 residues in length, and both binding domains have a combined total length of at least 8 residues.

This invention also provides a first pharmaceutical composition comprising the instant catalytic ribonucleic acid molecule or deoxyribonucleic acid molecule and a pharmaceutically acceptable carrier.

This invention further provides a method of specifically cleaving Hairless Protein mRNA comprising contacting the mRNA with either of the instant catalytic nucleic acid molecules under conditions permitting the molecule to cleave the mRNA.

This invention further provides a method of specifically cleaving Hairless Protein mRNA in a cell, comprising contacting the cell containing the mRNA with either of the instant catalytic nucleic acid molecules so as to specifically cleave the hairless protein mRNA in the cell.

This invention further provides a method of specifically inhibiting the expression of Hairless Protein in a cell that would otherwise express Hairless Protein, comprising contacting the cell with either of the instant catalytic nucleic acid molecules so as to specifically inhibit the expression of Hairless Protein in the cell.

This invention further provides a method of specifically inhibiting the expression of Hairless Protein in a subject's cells comprising administering to the subject an amount of either of the instant catalytic nucleic acid molecules effective to specifically inhibit the expression of Hairless Protein in the subject's cells.

This invention further provides a method of specifically inhibiting the expression of Hairless Protein in a subject's cells comprising administering to the subject an amount of the first pharmaceutical composition effective to specifically inhibit the expression of Hairless Protein in the subject's cells.

This invention further provides a method of inhibiting hair production by a hair-producing cell comprising contacting the cell with an effective amount of either of the instant catalytic nucleic acid molecules.

This invention further provides a method of inhibiting hair growth in a subject comprising administering to the subject an effective amount of the first pharmaceutical composition.

This invention further provides a method of inhibiting the transition of a hair follicle from the anagen phase to the catagen phase comprising contacting the follicle with an effective amount of either of the instant catalytic nucleic acid molecules or the first pharmaceutical composition.

This invention further provides a vector which comprises a sequence encoding either of the instant catalytic nucleic acid molecules.

This invention further provides a host-vector system comprising a cell having the instant vector therein. This invention still further provides a method of producing either of the instant catalytic nucleic acid molecules comprising culturing a cell having therein a vector comprising a sequence encoding either catalytic nucleic acid molecule under conditions permitting the expression of the catalytic nucleic acid molecule by the cell.

This invention further provides a nucleic acid molecule that specifically hybridizes to Hairless Protein mRNA so as to inhibit the translation thereof in a cell.

The invention further provides a second pharmaceutical composition comprising (a) the instant nucleic acid molecule or the instant vector and (b) a pharmaceutically acceptable carrier.

This invention further provides a method of specifically inhibiting the expression of Hairless Protein in a cell that would otherwise express Hairless Protein, comprising contacting the cell with the instant nucleic acid molecule so as to specifically inhibit the expression of Hairless Protein in the cell.

This invention further provides a method of specifically inhibiting the expression of Hairless Protein in a subject's cells comprising administering to the subject an amount of the instant nucleic acid molecule effective to specifically inhibit the expression of Hairless Protein in the subject's cells.

This invention further provides a method of specifically inhibiting the expression of Hairless Protein in a subject's cells comprising administering to the subject an amount of the second pharmaceutical composition effective to specifically inhibit the expression of Hairless Protein in the subject's cells.

This invention further provides a method of inhibiting hair production by a hair-producing cell comprising contacting the cell with an effective amount of the instant nucleic acid molecule.

This invention further provides a method of inhibiting hair growth in a subject comprising administering to the subject an effective amount of the second pharmaceutical composition.

This invention further provides a method of inhibiting the transition of a hair follicle from the anagen phase to the catagen phase comprising contacting the follicle with an effective amount of the instant nucleic acid molecule or the second pharmaceutical composition.

This invention further provides a method of producing the instant nucleic acid molecule comprising culturing a cell having therein a vector comprising a sequence encoding said nucleic acid molecule under conditions permitting the expression of the nucleic acid molecule by the cell.

Finally this invention provides a non-human transgenic mammal, wherein the mammal's genome:

-   -   (a) has stably integrated therein a nucleotide sequence encoding         a human Hairless Protein operably linked to a promoter, whereby         the nucleotide sequence is expressed; and     -   (b) lacks an expressible endogenous hairless Protein-encoding         nucleic acid sequence.

BRIEF DESCRIPTION OF THE FIGURES

FIGS. 1A-1C: These figures show the mRNA sequence of Human Hairless Protein (SEQ ID NO:1).

FIGS. 2A-2D: FIGS. 2B-2D show the pathology of C67BL/J mice treated with anti-Hairless Protein deoxyribozymes. FIG. 2A shows a control area treated with a non-specific deoxyribozyme.

FIG. 3: This figure shows reverse transcriptase polymerase chain reaction products visualized on an ethidium bromide-containing 2% agarose gel under UV light. Those deoxyribozymes that were capable of cleaving the target mouse Hairless Protein mRNA with the highest efficiency were used for in vivo experiments, as shown in lanes (“702”) and 3 (“754\sht”).

FIG. 4: This figure shows antisense oligonucleotide inhibition of Hairless Protein expression in Cos-1 cells. Lane 1 is the negative control where cells were not transfected with the full-length Hairless construct. Lane 2 shows Hairless expression in the positive control experiment where antisense oligonucleotides were not introduced. Lanes 3 and 4 show the inhibition of Hairless where anti-Hairless antisense ODN1 (SEQ ID NO:26) and ODN2 (SEQ ID NO:27), respectively, were added to the medium at 40 μM concentration prior to transfection.

DETAILED DESCRIPTION OF THE INVENTION DEFINITIONS

As used herein, and unless stated otherwise, each of the following terms shall have the definition set forth below.

“Administering” shall mean administering according to any of the various methods and delivery systems known to those skilled in the art. The administering can be performed, for example, via implant, transmucosally, transdermally and subcutaneously. In the preferred embodiment, the administering is topical and preferably dermal.

“Catalytic” shall mean the functioning of an agent as a catalyst, i.e. an agent that increases the rate of a chemical reaction without itself undergoing a permanent structural change.

“Consensus sequence” shall mean a nucleotide sequence of at least two residues in length between which catalytic nucleic acid cleavage occurs. For example, consensus sequences include “A:C” and “G:U”.

“Hairless Protein” shall mean the protein encoded by the nucleotide sequence shown in FIGS. 1A-1C (SEQ ID NO:1) and having the amino acid sequence shown in SEQ ID NO:17, and any variants thereof, whether artificial or naturally occurring. Variants include, without limitation, homologues, post-translational modifications, mutants such as those commonly referred to as T1022A, 1256delC, 1261del21, R620Q, 2001delCCAG, 2776+1G→A, N970K V1136D, 3434delC and 2147delC, and polymorphisms such as the one commonly referred to as L526P.

“Hairless Protein mRNA” shall mean any mRNA molecule comprising a sequence which encodes Hairless Protein. Hairless Protein mRNA includes, without limitation, protein-encoding sequences as well as the 5′ and 3′ non-protein-encoding sequences. An example of Hairless Protein mRNA is the mRNA sequence shown in FIG. 1. As used herein, the terms “Hairless Protein”, “Hairless”, “hairless protein” and “hairless” are used interchangeably, unless stated otherwise.

“Hybridize” shall mean the annealing of one single-stranded nucleic acid molecule to another nucleic acid molecule based on sequence complementarity. The propensity for hybridization between nucleic acids depends on the temperature and ionic strength of their milieu, the length of the nucleic acids and the degree of complementarity. The effect of these parameters on hybridization is well known in the art (see Sambrook, 1989).

“Inhibit” shall mean to slow, stop or otherwise impede.

“Nucleic acid molecule” shall mean any nucleic acid molecule, including, without limitation, DNA, RNA and hybrids thereof The nucleic acid bases that form nucleic acid molecules can be the bases A, C, G, T and U, as well as derivatives thereof Derivatives of these bases are well known in the art, and are exemplified in PCR Systems, Reagents and Consumables (Perkin Elmer Catalogue 1996-1997, Roche Molecular Systems, Inc., Branchburg, N.J., USA).

“Pharmaceutically acceptable carrier” shall mean any of the various carriers known to those skilled in the art. In one embodiment, the carrier is an alcohol, preferably ethylene glycol. In another embodiment, the carrier is a liposome. The following pharmaceutically acceptable carriers are set forth, in relation to their most commonly associated delivery systems, by way of example, noting the fact that the instant pharmaceutical compositions are preferably delivered dermally.

Dermal delivery systems include, for example, aqueous and nonaqueous gels, creams, multiple emulsions, microemulsions, liposomes, ointments, aqueous and nonaqueous solutions, lotions, aerosols, hydrocarbon bases and powders, and can contain excipients such as solubilizers, permeation enhancers (e.g., fatty acids, fatty acid esters, fatty alcohols and amino acids), and hydrophilic polymers (e.g., polycarbophil and polyvinylpyrolidone). In one embodiment, the pharmaceutically acceptable carrier is a liposome or a transdermal enhancer. Examples of liposomes which can be used in this invention include the following: (1) CellFectin, 1:1.5 (M/M) liposome formulation of the cationic lipid N,NI,NII,NIII-tetramethyl-N,NI,NII,NIII-tetrapalmity-spermine and dioleoyl phosphatidylethanol-amine (DOPE) (GIBCO BRL); (2) Cytofectin GSV, 2:1 (M/M) liposome formulation of a cationic lipid and DOPE (Glen Research); (3) DOTAP (N-[1-(2,3-dioleoyloxy)-N,N,N-tri-methyl-ammoniummethylsulfate) (Boehringer Manheim); and (4) Lipofectamine, 3:1 (M/M) liposome formulation of the polycationic lipid DOSPA and the neutral lipid DOPE (GIBCO BRL).

Transmucosal delivery systems include patches, tablets, suppositories, pessaries, gels and creams, and can contain excipients such as solubilizers, and enhancers (e.g., propylene glycol, bile salts and amino acids), and other vehicles (e.g., polyethylene glycol, fatty acid esters and derivatives, and hydrophilic polymers such as hydroxypropylmethylcellulose and hyaluronic acid).

Injectable drug delivery systems include solutions, suspensions, gels, microspheres and polymeric injectables, and can comprise excipients such as solubility-altering agents (e.g., ethanol, propylene glycol and sucrose) and polymers (e.g., polycaprylactones and PLGA's). Implantable systems include rods and discs, and can contain excipients such as PLGA and polycaprylactone.

Oral delivery systems include tablets and capsules. These can contain excipients such as binders (e.g., hydroxypropylmethylcellulose, polyvinyl pyrilodone, other cellulosic materials and starch), diluents (e.g., lactose and other sugars, starch, dicalcium phosphate and cellulosic materials), disintegrating agents (e.g., starch polymers and cellulosic materials) and lubricating agents (e.g., stearates and talc).

“Specifically cleave”, when referring to the action of one of the instant catalytic nucleic acid molecules on a target mRNA molecule, shall mean to cleave the target mRNA molecule without cleaving another mRNA molecule lacking a sequence complementary to either of the catalytic nucleic acid molecule's two binding domains.

“Subject” shall mean any animal, such as a human, a primate, a mouse, a rat, a guinea pig or a rabbit.

“Vector” shall include, without limitation, a nucleic acid molecule that can be used to stably introduce a specific nucleic acid sequence into the genome of an organism.

Finally, the following abbreviations shall have the meanings set forth below: “A” shall mean Adenine; “bp” shall mean base pairs; “C” shall mean Cytosine; “DNA” shall mean deoxyribonucleic acid; “G” shall mean Guanine; “mRNA” shall mean messenger ribonucleic acid; “RNA” shall mean ribonucleic acid; “RT-PCR” shall mean reverse transcriptase polymerase chain reaction; “RY” shall mean purine:pyrimidine; “T” shall mean Thymine; and “U” shall mean Uracil.

Embodiments of the Invention

This invention provides a catalytic deoxyribonucleic acid molecule that specifically cleaves Hairless Protein mRNA comprising:

-   -   (a) a catalytic domain that cleaves mRNA at a defined consensus         sequence;     -   (b) a binding domain contiguous with the 5′ end of the catalytic         domain; and     -   (c) a binding domain contiguous with the 3′ end of the catalytic         domain,

wherein the binding domains are complementary to, and therefore hybridize with, the two regions flanking the defined consensus sequence within the Hairless Protein mRNA at which cleavage is desired, and wherein each binding domain is at least 4 residues in length, and both binding domains have a combined total length of at least 8 residues. In the preferred embodiment, each binding domain is 7 residues in length, and both binding domains have a combined total length of 14 residues.

The catalytic domain may optionally contain stem-loop structures in addition to the nucleotides required for catalytic activity. In one embodiment of the instant catalytic deoxyribonucleic acid molecule, the catalytic domain has the sequence ggctagctacaacga (SEQ ID NO:18), and cleaves mRNA at the consensus sequence purine:pyrimidine. In a preferred embodiment, cleavage occurs at one or more of the following cleavage sites in the Hairless Protein mRNA (shown in FIGS. 1A-1C and SEQ ID NO:1), wherein the indicated nucleotide residue immediately precedes the cleavage site: 1594, 1597, 1641, 1698, 1732, 1750, 1801, 1811, 2028, 2033, 2047, 2083, 2269, 2380 and 2395.

In another embodiment the instant deoxyribonucleic acid molecule has a sequence selected from the group consisting of:

(a) cccatggggctagctacaacgagcagtcc; (SEQ ID NO: 2) (b) cggcccaggctagctacaacgaggtgcag; (SEQ ID NO: 3) (c) ctcaggaggctagctacaacgagcccctc; (SEQ ID NO: 4) (d) gggagcaggctagctacaacgagtccttg; (SEQ ID NO: 5) (e) ctccccaggctagctacaacgatctgggg; (SEQ ID NO: 6) (f) cagccagggctagctacaacgatgacctt; (SEQ ID NO: 7) (g) cagcggaggctagctacaacgagggtaag; (SEQ ID NO: 8) (h) cgcagaaggctagctacaacgagccagcg; (SEQ ID NO: 9) (i) tgcggggggctagctacaacgacaggggc; (SEQ ID NO: 10) (j) aggggtgggctagctacaacgaggggtca; (SEQ ID NO: 11) (k) cccggagggctagctacaacgaataccca; (SEQ ID NO: 12) (l) gcctaagggctagctacaacgatgaaggc; (SEQ ID NO: 13) (m) gcaaggaggctagctacaacgatctgctg; (SEQ ID NO: 14) (n) gttcccaggctagctacaacgacgcctgg; (SEQ ID NO: 15) and (O) cagctggggctagctacaacgaacccaag. (SEQ ID NO: 16)

This invention also provides a catalytic ribonucleic acid molecule that specifically cleaves Hairless Protein mRNA comprising:

-   -   (a) a catalytic domain that cleaves mRNA at a defined consensus         sequence;     -   (b) a binding domain contiguous with the 5′ end of the catalytic         domain; and     -   (c) a binding domain contiguous with the 3′ end of the catalytic         domain,

wherein the binding domains are complementary to, and therefore hybridize with, the two regions flanking the defined consensus sequence within the Hairless Protein mRNA at which cleavage is desired, and wherein each binding domain is at least 4 residues in length and both binding domains have a combined total length of at least 8 residues.

In one embodiment of the instant catalytic ribonucleic acid molecule, each binding domain is at least 12 residues in length. In the preferred embodiment, each binding domain is no more than 17 residues in length. In another embodiment, both binding domains have a combined total length of at least 24 residues, and no more than 34 residues.

Preferably, the instant catalytic ribonucleic acid molecule is a hammerhead ribozyme. Hammerhead ribozymes are well known in the literature, as described in Pley et al, 1994. In one embodiment, the consensus sequence is the sequence 5′-NUH-3′, where N is any nucleotide, U is uridine and H is any nucleotide except guanine. An example of such sequence is 5′-adenine:uracil:adenine-3′. In another embodiment, the catalytic domain has the sequence ctgatgagtccgtgaggacgaaaca (SEQ ID NO:19).

In this invention, the instant catalytic nucleic acid molecules can cleave Hairless Protein mRNA at each and any of the consensus sequences therein. Since ribozyme and DNAzyme consensus sequences are known, and the Hairless Protein mRNA sequence is known, one of ordinary skill could readily construct a catalytic nucleic acid molecule directed to any of the Hairless Protein mRNA consensus sequences based on the instant specification. In a preferred embodiment, the cleavage occurs at one or more of the following cleavage sites in Hairless Protein mRNA (sequence shown in FIGS. 1A-1C and SEQ ID NO:1), wherein the indicated nucleotide residue immediately precedes the cleavage site: −94, 159, 264, 506, 847 and 879. The number −94 indicates a target site upstream from the 5′ end of the sequence shown in FIG. 1, in the 5′ untranslated region of the sequence.

In another embodiment, the instant catalytic ribonucleic acid molecule has a sequence selected from the group consisting of:

(a) cggccggcgggcgagctgatgagtccgtgaggacgaaacacgcgttctcccgctct; (SEQ ID NO: 20) (b) gagtctggggtgctcagctgatgagtccgtgaggacgaaacacgcccctccaaaaagg; (SEQ ID NO: 21) (c) ttgctgcccagccagttctgatgagtccgtgaggacgaaacaccttcctctccccatt; (SEQ ID NO: 22) (d) gctctgggggcaggccactgatgagtccgtgaggacgaaacacactaggtagggtggc; (SEQ ID NO: 23) (e) atgaacaaggcctggggctgatgagtccgtgaggacgaaacacaagcgggccaggagg; (SEQ ID NO: 24) and (f) tcgcctggcccagcccactgatgagtccgtgaggacgaaacacgttgccaagagtatg. (SEQ ID NO: 25)

In an alternative embodiment of the instant catalytic ribonucleic acid molecule, the molecule is a hairpin ribozyme. Hairpin ribozymes are well known in the literature as described in Fedor (2000).

Catalytic nucleic acid molecules can be directed to any cleavage site within the Hairless Protein mRNA, preferably within the 5′ half of the mRNA. In one embodiment the cleavage site within the hairless protein mRNA is located within the first 3000 residues following the mRNA's 5′ terminus. In another embodiment cleavage occurs within the first 1500 residues. Here, “following” means in the 3′ direction of the 5′ terminus.

The Hairless Protein mRNA cleaved by the instant catalytic nucleic acid molecules can be from any subject. In one embodiment, the Hairless Protein mRNA is from a subject selected from the group consisting of human, monkey, rat and mouse, and in the preferred embodiment is human. In the preferred embodiment, the Hairless Protein mRNA has the sequence shown in FIGS. 1A -1C.

This invention also provides a first pharmaceutical composition comprising the instant catalytic ribonucleic acid molecule or deoxyribonucleic acid molecule and a pharmaceutically acceptable carrier.

This invention further provides a method of specifically cleaving Hairless Protein mRNA comprising contacting the mRNA with either of the instant catalytic nucleic acid molecules under conditions permitting the molecule to cleave the mRNA. These conditions are well known in the art and include physiological conditions.

This invention further provides a method of specifically cleaving Hairless Protein mRNA in a cell, comprising contacting the cell containing the mRNA with either of the instant catalytic nucleic acid molecules so as to specifically cleave the hairless protein mRNA in the cell. The cell containing Hairless Protein mRNA can be, for example, a naturally occurring cell or a transgenic cell. In the preferred embodiment, the cell is a keratinocyte.

This invention further provides a method of specifically inhibiting the expression of Hairless Protein in a cell that would otherwise express Hairless Protein, comprising contacting the cell with either of the instant catalytic nucleic acid molecules so as to specifically inhibit the expression of Hairless Protein in the cell.

This invention further provides a method of specifically inhibiting the expression of Hairless Protein in a subject's cells comprising administering to the subject an amount of either of the instant catalytic nucleic acid molecules effective to specifically inhibit the expression of Hairless Protein in the subject's cells.

This invention further provides a method of specifically inhibiting the expression of Hairless Protein in a subject's cells comprising administering to the subject an amount of the first pharmaceutical composition effective to specifically inhibit the expression of Hairless Protein in the subject's cells.

Determining the effective amount of the instant pharmaceutical composition can be done based on animal data using routine computational methods. In one embodiment, the effective amount contains between about 10 ng and about 100 μg of the instant nucleic acid molecules per square centimeter of skin. In another embodiment, the effective amount contains between about 100 ng and about 10 μg of the nucleic acid molecules per square centimeter of skin. In a further embodiment, the effective amount contains between about 1 μg and about 5 μg and preferably about 2 μg, of the nucleic acid molecules per square centimeter of skin.

This invention further provides a method of inhibiting hair production by a hair-producing cell comprising contacting the cell with an effective amount of either of the instant catalytic nucleic acid molecules.

This invention further provides a method of inhibiting hair growth in a subject comprising administering to the subject an effective amount of the first pharmaceutical composition.

Hair follicles are dynamic structures that generate hair through a regulated cycle of growth and remodeling. The hair follicle cycles between rest (telogen), I growth (anagen) and regression (catagen). This invention further provides a method of inhibiting the transition of a hair follicle from the anagen phase to the catagen phase comprising contacting the follicle with an effective amount of either of the instant catalytic nucleic acid molecules or the first pharmaceutical composition.

This invention further provides a vector which comprises a sequence encoding either of the instant catalytic nucleic acid molecules.

This invention further provides a host-vector system comprising a cell having the instant vector therein. This invention still further provides a method of producing either of the instant catalytic nucleic acid molecules comprising culturing a cell having therein a vector comprising a sequence encoding either catalytic nucleic acid molecule under conditions permitting the expression of the catalytic nucleic acid molecule by the cell. Methods of culturing cells in order to permit expression and conditions permitting expression are well known in the art. For example see Sambrook et al. (1989). Such methods can optionally comprise a further step of recovering the nucleic acid product.

This invention provides a nucleic acid molecule that specifically hybridizes to Hairless Protein mRNA so as to inhibit the translation thereof in a cell.

In one embodiment, the instant nucleic acid is a ribonucleic acid. In another embodiment the nucleic acid is deoxyribonucleic acid.

The invention further provides a second pharmaceutical composition comprising (a) the instant nucleic acid molecule or the instant vector and (b) a pharmaceutically accpetable carrier.

This invention further provides a method of specifically inhibiting the expression of Hairless Protein in a cell that would otherwise express Hairless Protein, comprising contacting the cell with the instant nucleic acid molecule so as to specifically inhibit the expression of Hairless Protein in the cell.

This invention further provides a method of specifically inhibiting the expression of Hairless Protein in a subject's cells comprising administering to the subject an amount of the instant nucleic acid molecule effective to specifically inhibit the expression of Hairless Protein in the subject's cells.

This invention further provides a method of specifically inhibiting the expression of Hairless Protein in a subject's cells comprising administering to the subject an amount of the second pharmaceutical composition effective to specifically inhibit the expression of Hairless Protein in the subject's cells.

This invention further provides a method of inhibiting hair production by a hair-producing cell comprising contacting the cell with an effective amount of the instant nucleic acid molecule.

This invention further provides a method of inhibiting hair growth in a subject comprising administering to the subject an effective amount of the second pharmaceutical composition.

This invention further provides a method of inhibiting the transition of a hair follicle from the anagen phase to the catagen phase comprising contacting the follicle with an effective amount of the instant nucleic acid molecule or the second pharmaceutical composition.

This invention further provides a method of producing the instant nucleic acid molecule comprising culturing a cell having therein a vector comprising a sequence encoding said nucleic acid molecule under conditions permitting the expression of the nucleic acid molecule by the cell.

Finally this invention provides a non-human transgenic mammal, wherein the mammal's genome:

-   -   (a) has stably integrated therein a nucleotide sequence encoding         a human Hairless Protein operably linked to a promoter, whereby         the nucleotide sequence is expressed; and     -   (b) lacks an expressible endogenous Hairless Protein-encoding         nucleic acid sequence.

In the preferred embodiment, the transgenic mammal is a mouse. The instant transgenic mammal is useful as a model for testing hair removal products which function by inhibiting Hairless Protein expression.

In this invention, the various embodiments of subjects, pharmaceutically acceptable carriers, dosages, cell types, routes of administration and target nucleic acid sequences are envisioned for each of the instant nucleic acid molecules, pharmaceutical compositions and methods. Moreover, in this invention, the various embodiments of methods, subjects, pharmaceutically acceptable carriers, dosages, cell types, routes of administration and target nucleic acid sequences are envisioned for all non-nucleic acid agents which inhibit the expression of Hairless Protein. Such non-nucleic acid agents include, without limitation, polypeptides, carbohydrates and small organic compounds.

This invention will be better understood by reference to the Experimental Details which follow, but those skilled in the art will readily appreciate that the specific experiments detailed are only illustrative of the invention as described more fully in the claims which follow thereafter.

Experimental Details Part I—Catalytic Nucleic Acids Introduction

Catalytic nucleic acid technology is widely used to target mRNA in a sequence-specific fashion, and thus change the expression pattern of cells or tissues. While the goal of mRNA targeting is usually the cleavage of mutant mRNA with the prospect of gene therapy for inherited diseases, in certain instances targeting of wild-type genes can be used therapeutically.

Lack of expression of the mouse hairless gene due to inherited mutations leads to the complete loss of hair, known as atrichia. This study was designed to recapitulate the hairless phenotype in a restricted manner by topical application of deoxy-ribozyme molecules to specifically cleave the mouse hairless mRNA. Pathology samples taken from the treated area at different times demonstrated a decreased number of hair follicles, involution of the remaining follicles, separation of the dermal papillae and the presence of dermal cysts, all characteristics of the hairless phenotype but not normally present in the skin of C57B1/6J mice.

In this study, the hairless phenotype is successfully recapitulated using topically applied target-specific catalytic oligonucleotides designed to cleave the mouse hairless mRNA. Hence, this invention demonstrates the feasibility of using ribozyme and deoxy-ribozyme technology to alter gene expression in the skin via topical application and provide permanent hair removal.

Materials and Methods

Deoxy-ribozyme design and in vitro testing. To target the mouse hairless mRNA, a series of deoxy-ribozymes were designed based on the consensus cleavage sites 5′-RY-3′ in the mRNA sequence (GenBank Accession#: AF039196) (Ahmad et al. 1998a). Only those potential cleavage sites which were located on an open loop of the mRNA according to the RNA folding software RNADRaw 2.1 were targeted (Matzura and Wennborg 1996). The deoxy-ribozyme design utilized the previously described structure (Santoro and Joyce 1997; Santoro and Joyce 1998) where two sequence-specific arms were attached to a catalytic core based on the mouse hairless mRNA sequence. The deoxy-ribozymes were custom synthesized (Life Technologies). Commercially available mouse brain polyA-RNA (Ambion) served as a template in the in vitro cleavage reaction to test the efficiency of the deoxy-ribozymes. 800 ng RNA template were incubated in the presence of 20 mM Mg2++ and RNAse Out RNAse inhibitor (Life Technologies) at pH 7.5 with 2 deoxy-ribozyme for one hour. After incubation, aliquots of the reaction were used as templates for RT-PCR, amplifying regions including the targeted cleavage sites. The RT-PCR products were visualized on an ethidium bromide-containing 2% agarose gel under UV light, and the intensity of the products was determined as described above (FIG. 3). Those deoxy-ribozymes that were capable of cleaving the target mouse hairless mRNA with the highest efficiency were used for in vivo experiments (FIG. 3, lanes 1, 3).

Deoxy-ribozyme treatment schedule. Newborn C57B1/6J mice were treated with a deoxy-ribozyme formula twice a day starting on the first day after delivery. As the mice started to grow hair, hair shafts were regularly shortened using an electric clipper to make the skin surface accessible and to enhance the penetration of the treatment formula. For each treatment, 2 deoxy-ribozyme, dissolved in a 85% EtOH and 15% ethylene glycol vehicle, were applied to a one square centimeter area on the back. During application and for a fifteen minute period after, the mice were placed in temporary restraint to prevent removal of the formula. Control animals were treated with vehicle containing oligonucleotides of the same length but of random sequence. The treatment continued until the mice were sacrificed for evaluation.

Biopsy Procedures and Pathology. The mice were humanely euthanized after 28 days, 35 days or 8 weeks of treatment. The entire treatment area, together with an equal sized non-treated neighboring area of skin, were removed, fixed in formalin solution, embedded and processed for pathology using standard procedures.

Results

To evaluate the feasibility of using topically applied deoxy-ribozymes for selective ablation of genes expressed in the hair follicle, a model system was used to recapitulate the hairless mouse phenotype. After secondary structure based target-site selection, the choices were narrowed for targeting oligonucleotides using a novel in vitro cleavage assay (Cserhalmi-Friedman et al. manuscript in preparation). The three deoxy-ribozymes that proved to be the most efficient in cutting full-length mouse hairless mRNA in vitro were used for the in vivo experiments.

After continuous treatment, by day 20 the hair of the treated animals became visibly sparse on the treated area. Pathology specimens taken from the treated area at day 28 (see FIGS. 2A-2D) demonstrated (i) a decreased number of hair follicles, (ii) several dense, basophilic cell groups in the dermis corresponding to dermal papillae by morphology and localization, and (iii) an absence of surrounding epithelial hair follicle tissues and related hair follicles. The remaining hair follicles were in telogen phase, in sharp contrast with the advanced anagen follicles of the surrounding untreated skin and the skin of the untreated control animals.

Samples taken from the treated area at day 35 showed a different result. Some follicles in telogen phase could be observed, although they were more sparse than in the surrounding untreated area or in the samples from the untreated control animals. In the dermis of the treated region, large epithelial cysts filled with amorphous material were noticed, which corresponded to dermal cysts. These characteristics, the arrest of hair cycling, involution of hair follicles, detachment of dermal papillae and development of dermal cysts are not normally present in C57B1/6J mice, but represent the cardinal features of the skin of the hairless mouse.

The data revealed here demonstrate that by using topically applied catalytic oligonucleotides, a key player of hair follicle regulation can be eliminated and hair follicle cycling can be disrupted. These results serve not only as a proof of principle for future use of this approach for hair removal, but also demonstrate the feasibility of using topical catalytic nucleic acid technology to successfully change the gene expression pattern of hair follicle cells at the mRNA level, and thus influence the hair phenotype.

Part II—Antisense Nucleic Acids

Antisense oligodeoxynucleotides were synthesized as directed to the inhibition of Hairless expression based on the Hairless mRNA sequence (SEQ ID NO:1). Cos-1 cells were transfected with the pEGFP full-length Hairless construct, and cells were harvested 16 hours after transfection. Total protein lysate was analyzed on a 10% SDS PAGE gel and transferred to nitrocellulose. Hairless protein was detected using an anti-Hairless polyclonal antibody raised against a C-terminal peptide. In a negative control, cells not transfected with the full-length Hairless construct showed no Hairless expression. Hairless expression was clearly observed in positive control experiments when antisense oligodeoxynucleotides were not added. Experiments where anti-Hairless antisense oligonucleotides (i.e. ODN1: 5′ GCTGGGCATACTCTCCAT 3′ (SEQ ID NO:26) and ODN2: 5′ CATCACTCTCCTGCCCTC 3′ (SEQ ID NO:27)) were added to the medium at 40 μM concentration prior to the transfection clearly showed an absence of Hairless expression, demonstrating antisense oligodeoxynucleotide inhibition of the Hairless gene product (see FIG. 4).

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1. A nucleic acid molecule that specifically hybridizes to Hairless Protein mRNA so as to inhibit the translation thereof in a cell, wherein the nucleic acid molecule comprises consecutive nucleotides having the sequence of SEQ ID NO:27.
 2. A vector that comprises a sequence encoding the nucleic acid molecule of claim
 1. 3. A host-vector system comprising a cell having the vector of claim 2 therein.
 4. A pharmaceutical composition comprising (a) the nucleic acid molecule of claim 1 or the vector of claim 2 and (b) a pharmaceutically acceptable carrier.
 5. The pharmaceutical composition of claim 4, wherein the carrier is selected from the group consisting of an alcohol, ethylene glycol and a liposome.
 6. The nucleic acid molecule of claim 1, wherein the Hairless Protein mRNA has the sequence as set forth in SEQ ID NO:1. 